Final answer:
The check should be written as Pay to the Order of "Cash" to enable Spiderman to cash it anonymously and without ID.
Step-by-step explanation:
To best accommodate Spiderman's situation, the reward check should be written as Pay to the Order of "Cash". This way, he would not need to provide any ID and could remain anonymous while cashing the check. Checks made out to Cash can be cashed by anyone in possession of the check, making this the easiest option for an individual without a valid ID or who wish to maintain their anonymity.